Failover time using BFD

[vicky.dhas]

Hi Champs,

we have configured BFD in multihoming scenario with BGP routing protocol.Timer configuration is bfd interval 100 min_rx 100 multiplier 5.

Failover from first ISP to second ISP takes 30 sec and same from first ISP to second ISP takes more than 1min. Can you suggest reason for different failver times and how can i have equal failover time from both ISP.How convergence time is calculated in BGP + BFD scenario?

Regards

V

[Emmanouil Patiniotakis]

Have you enabled bfd on bgp neighborship? I think the command is:

neighbor xxxx fall-over bfd

[vicky.dhas]

of course..its enabled

[Nagendra Kumar Nainar]

Vicky,

A simple topology would help better understand the scenario. Do you have both the ISP terminated on same router or different router?.

How many prefixes are you learning?. Full internet table or few prefixes?.

Accordingly, you can consider BGP PIC or best external to speed up the convergence.

-Nagendra

[vicky.dhas]

Hi ,

Links are terminating on different router and only defualt route is learning

enabled BGP multipath for lnk load sharing

thanks

[Rajesh Hirani]

Have you tried bfd fast-detect under BGP?
 

[ldmccalla]

Does the ISP support BFD??

[Emmanouil Patiniotakis]

If its enabled, BGP neighborship should get teared up immediately after the bfd failure (about 500-600ms)...